‘According to the postwar interrogations of
German intelligence officers operating in Switzerland (2) in 1941 they were
able to recruit a spy inside the US embassy in Bern. This person, named Fuerst,
had access to the office of the US military attaché General Legge and he was
able to take documents plus the used carbon paper and give it to the
Germans.

The stolen reports revealed some of
Legge’s sources and showed that he got information from his British, Polish and
French counterparts. The used carbon paper also contained valuable information
but it had to be examined by experts in Germany. The information uncovered from
these sources was also used to decipher some of his messages.

The German spy was arrested in March 1942 but
this doesn’t seem to have ended the compromise of General Legge’s
communications. In the Finnish national archives, in collection T-21810/4,
there are a few messages signed Legge from March and April ’43. The originals are
from NARA, collection RG 319 'Records of the Army Staff'’